It's no secret that sports fans can be unreasonably harsh, and Kristin Cavallari is finding that out the hard way!!

Yesterday afternoon, the former reality starlet decided to show some support for her football slinging hubby Jay Cutler by posting a makeup-less selfie (above) to her Instagram before the Chicago Bears' big game!

However, things took a nasty turn early in the second quarter when he had to be carted off the field with a serious groin injury! Ouchies!!

One "fan" decided to literally add insult to injury by attacking Kristin on Twitter by saying she wasn't taking her husband's injury seriously!